Yep it's a Dumb Question RE: DFM

[Mac-427]

Does my 2020 Silverado 5.3 Six Speed have DFM?  If it does, I've been unable to detect it during driving.  I've tried to research the question and come up with conflicting answers.  Some say all 5.3 engines have DFM and a few say some of them don't.  I figure someone on this Forum will know for sure.  Thank You

[redwngr]

That's one of the reasons they went to DFM.

Many many modes, more seamless/harder to detect. Change change number constantly. 

That said imo AFM was more 'seamless' than it is often accused of being -- but that also depends on how the truck was being used.

 

https://gmauthority.com/blog/gm/general-motors-technology/general-motors-propulsion-technology/general-motors-dynamic-fuel-management-cylinder-deactivation-technology/ 

 

DFM vs AFM 

https://gm-techlink.com/?p=11880

 

If you have an L82 (base sierra, or WT or Custom or Custom Trailboss) it will have AFM

If you have an L84 (any other trim) it will have DFM

 

 

In 2020,  5.3L engines with 6 speeds were with L82's and 5.3L with 8 speeds were with L84's  

 

 

 

Edited January 10, 2021 by redwngr